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Author email
[email protected]
Author website
www.rickeyworld.info

Description



DS1307 is a hardware realtime clock, which works on I2C protocol. Better graphics using the same old fashioned alphanumeric LCD (type HD44780). Icons which shows the status for Alarm ON/OFF state, which gives a nice and cute look to the clock.

There are four switches connected to the uC, as shown in the figure. Function of the keys are same as clear from their names.

When the power supply is switched on it will give you the default date and time, but later you can change it to the desired value. After setting once, the backup battery will keep the clock ticking even after the power is not there.

A little about I2C:
There are basically four main conditions in I2C protocol.
1) Start Condition
2)Stop Condition
3)Data Validity
4)Acknowledgement

1)Start Condition:
when SCL is high and SDA H->L, will be taken as start condition for the communication.
2)Stop Condition:
when SCL is high and SDA L->H, will generate a stop condition.
3)Data Validity:
When SCL is high there should be no chande in SDA line only then the data is valid, the data change should be made only when SCL is low.
4)Acknowledgement:

After sending of one byte of data the reciever has to acknowledge the sender for the successful reception. for this the sender make the SDA line high and reciever pulls down the SDA low, which tells the sender that data has reached safely.

Now the source code written in assembly, basically implements the I2C protocol. the assembly source written for Keil download here clock.asm and the direct hex file for programming the controller from here clock.hex. The schematic for the Digital clock is available in PDF format can be downloaded from here clock.pdf.

Project code has been revised and updated. Bug fixes regarding corrupt display.

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First Upload date:
08/05/2006
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Conversation

ExperimenterUK
Sat Sep 24 2016, 05:49 PM
@Rus Ans .. what project ?
ExperimenterUK
Sat Sep 24 2016, 05:48 PM
@engr1931 depends on type of scanner
engr1931
Sat Sep 24 2016, 03:07 PM
Is it possible to send data from 2 barcode scanner to pc using serial port using 8051?
Wed Sep 21 2016, 02:22 AM
Rus Ana
can anyone help me for my project? T.T
Fri Sep 09 2016, 02:54 PM
Sarath babu
8051 a/c motor speed control
Tue Aug 30 2016, 05:03 PM
Kinzang
hello sir, can i know more in detail about the football substitution board project.
Tue Aug 30 2016, 06:06 AM
bhagyashri buddhewad
my project is automatic room light controller using visitor counter so i want coding in keil and circuit diagram can tell me and i want to use uc at89c51 thanks you
ExperimenterUK
Sun Aug 28 2016, 08:32 PM
Which project ?
Sun Aug 28 2016, 05:21 AM
Dipankar Baishya
Hi sir.... I want do this project but I have not this sercuit diagram..... can you give me full details and diagram...... Thank you
Sat Aug 27 2016, 11:32 AM
pankaj kumar
view coding zig zag motion source in html

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ak_pan
Thu Sep 08 2016, 06:28 PM
martinsnc115877
Sat Aug 20 2016, 01:44 PM
rajavarmanslr
Thu Aug 18 2016, 12:24 PM
CASINODIGITAL
Mon Aug 15 2016, 09:04 PM
mariahcarey
Sat Aug 06 2016, 11:38 AM
dann11
Thu Jul 28 2016, 09:43 PM
adithyapaip
Thu Jul 21 2016, 05:45 PM
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Thu Jul 21 2016, 05:27 PM

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Forum Activity
martinsnc115877 Avatar
Posted By martinsnc115877
Wed Sep 14 2016, 12:51 PM
sir, i did your led scrolling mass display, and it...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Sep 09 2016, 11:45 PM
The Hex file for this project is a bit too big for...
rajavarmanslr Avatar
Posted By rajavarmanslr
Thu Aug 18 2016, 01:40 PM
I have two 8051 that interfaces with nRF24l01. One...
rajavarmanslr Avatar
Posted By rajavarmanslr
Thu Aug 18 2016, 12:31 PM
I have two 8051 that interfaces with nRF24l01. One...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon Aug 01 2016, 05:26 AM
is working nowugoo5000Great, thanks for letting u...
ugoo5000 Avatar
Posted By ugoo5000
Sat Jul 30 2016, 07:31 AM
is working noworg 00hmov p1,#11111111bmov p3,#1111...
ugoo5000 Avatar
Posted By ugoo5000
Sat Jul 30 2016, 06:40 AM
when i press a button in p3.0,the counter will st...
ugoo5000 Avatar
Posted By ugoo5000
Sat Jul 30 2016, 06:30 AM
proteus file Attachment ...
ExperimenterUK Avatar
Posted By ExperimenterUK
Fri Jul 29 2016, 11:34 PM
Your code does not count at all, it produces a one...
ugoo5000 Avatar
Posted By ugoo5000
Fri Jul 29 2016, 07:49 PM
i want the the counter to be counting in secs with...